Question 29
Energy ChangesWhich of the following processes leads to increase in entropy?
- A.Mixing a sample of NaCl and sand
- B.Condensation of water vapour
- C.Boiling a sample of water
- D.Cooling a saturated solution
Show the answer and explanation
Answer: C (Boiling a sample of water)
Explanation
Entropy measures disorder. Boiling turns an ordered liquid into a gas whose molecules move freely, a large increase in disorder. Condensing and cooling reduce disorder.